Seeking advice on the design of a stirred-tank reactor
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I am currently designing a mixing reactor with a volume of 30 cubic meters, to be used for producing PVC. I would like to ask everyone: what should be the length-to-diameter ratio for such reactors? GB 9845-1998 suggests several options, but after my calculations, either the length-to-diameter ratio needs to be high, which would require a double-layer mixing system; however, I don’t have any reference materials regarding double-layer mixing designs. Another option involves using a mixer with higher power, and different sources give varying values for its length-to-diameter ratio – some say that a ratio greater than 1.2 requires multiple mixing layers, while others state that multiple layers are needed only when the liquid level is four times the diameter of the mixer. If I use an inclined three-blade mixer, then a double-layer mixing system isn’t necessary. So, how should I make this choice? How do I calculate it? This is part of my graduation project, and I lack experience; I really appreciate any guidance you can provide. Thank you!! Please help me out with some references! This post was last edited by lxzzl on 2009-4-20 at 11:36
30 cubic. An inner diameter of 3200 and a height of 4000 should be about right. 1 layer of three-bladed swept paddles. It’s at the TL line of the lower head.
Equipment that is already in operation. D3200X3500: paddle length 1670, distance from the bottom 400, shaft diameter 160. Bro, the key is to know why you made that choice. One needs to do their own research; it’s not something that can be copied blindly. The above is for reference only.
The length-to-diameter ratio of such reaction vessels is determined by various factors, mainly including the type of agitator and the design of the heat transfer structure.